should 情態(tài)動(dòng)詞 通常用于許多表示情感的形容詞后的that從句中,表示“竟然”的意思.
例句：I found it astonishing that he should be so rude to you.他竟然對(duì)你這樣無(wú)禮,真讓我吃驚.
What have I done that you should be so angry with me?我做了什么,你竟然會(huì)這樣對(duì)我生氣?
這是個(gè)what引導(dǎo)的特殊疑問(wèn)句,語(yǔ)序倒裝,所以用have I done,而后面的that又引導(dǎo)了一個(gè)定語(yǔ)從句,用陳述語(yǔ)序.should在定語(yǔ)從句中是情態(tài)動(dòng)詞,加強(qiáng)語(yǔ)氣,表“竟然”.